By the somewhat crude measurement of total number of African-Americans to have held the title of commissioner or higher for any length of time, the Giuliani administration was in fact more diverse. But since the total number of black commissioners hired under Giuliani was in part a function of turnover, it's effectively a wash, as close as I can tell.

But since 2002, when Bloomberg took office, there have been six African-Americans who have held the title of commissioner for various agencies.

By comparison, according my count, which was assisted by a reader who worked for the previous mayor, the Giuliani administration had eight African-Americans as commissioners over eight years.

(And yes, it's also somewhat arbitrary to use Giuliani administration as the bar-setter on diversity in hiring, but for the sake of this exercise, I'll just compare the two. Please feel free to enlighten me about how each of them stacks up to earlier administrations.)

Here, according to a mayoral spokesman, is the list of African-Americans who have worked as commissioners in the Bloomberg administration since they took office in 2002: